Backrest and armrest synchronous adjustment device for a massage chair

ABSTRACT

An armrest and backrest synchronous adjustment device for a massage chair comprises a base, a backrest, at least two armrests and two rail members. The base is formed with a space. The backrest is pivoted on the base and located correspondingly to the space of the base. The armrests are pivoted to the base, and lower end of each of the armrests is located correspondingly to the space of the base. The rail members are mounted at the lower end of the armrests or the backrest and located in the space of the base, on each of the rail members is formed a slot that is used to rotate the armrests when the backrest is adjusted.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an adjustment device for a massagechair, and more particularly to a backrest and armrest synchronousadjustment device for a massage chair.

2. Description of the Prior Art

Most of the backrests of the existing massage chairs are adjustable andcan be fixed at different angles, and the tilt angle of the backrest isusually controlled by an advanced electronic control system. However,these conventional massage chairs still have the following shortcomingsthat need to be improved:

Firstly, the armrest is inflexible and cannot be adjusted in response tothe angle adjustment of the backrest, so that the user feelsuncomfortable since his arms cannot be laid comfortably on the armrestif the backrest is reclined back.

Secondly, since different users use the massage chair, the users whosearms are relatively short, like the children and old people, will feelparticularly uncomfortable due to their arms are too short to be rest onthe armrest after the backrest is reclined back.

The present invention has arisen to mitigate and/or obviate theafore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide an armrestand backrest synchronous adjustment device for a massage chaircomprising a base, a backrest, at least two armrests and two railmembers. The base is formed with a space. The backrest is pivoted on thebase and located correspondingly to the space of the base. The armrestsare pivoted to the base, and lower end of each of the armrests islocated correspondingly to the space of the base. The rail members aremounted at the lower end of the armrests or the backrest and located inthe space of the base, on each of the rail members is formed a slot thatis used to rotate the armrests when the backrest is adjusted.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawings,which show, for purpose of illustrations only, the preferred embodimentsin accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of an armrest and backrest synchronous adjustmentdevice for a massage chair in accordance with the present invention;

FIG. 2 is a side view of the armrest and backrest synchronous adjustmentdevice for a massage chair in accordance with the present invention;

FIG. 3 is an exploded view of an armrest in accordance with the presentinvention;

FIG. 4 is an assembly view of the armrest in accordance with the presentinvention;

FIG. 5 is an operational view of showing the armrest and backrestsynchronous adjustment device for a massage chair in accordance with thepresent invention;

FIG. 6 is another operational view of showing the armrest and backrestsynchronous adjustment device for a massage chair in accordance with thepresent invention;

FIG. 7 is an exploded view of a slide track structure of the armrest inaccordance with the present invention; and

FIG. 8 shows another slide track structure of the armrest in accordancewith the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1-4, an armrest and backrest synchronous adjustmentdevice for a massage chair in accordance with the present invention ismounted on a massage chair 10 and comprises: a base 20, a backrest 30,two armrests 40 and two rail members 50.

The base 20 is a rack assembly fixed to the bottom of the massage chair10 and is set firmly on the ground. The base 20 includes a narrow firstrack 21 and a wide second rack 22, the first rack 21 is located withinthe second rack 22, and between the first and second racks 21 and 22 isformed a space A.

The backrest 30 is pivoted to the first rack 21 of the base 20 and islocated correspondingly to the space A, and at both sides of the lowerend of the backrest 30 are coaxially arranged two pivotal shafts 31 oneach of which being mounted an extending rack 312 and a retainer 311.

The armrests 40 each includes a support portion 41, a pivot 42 and twopositioning cylinders 43 sequentially mounted on an armrest rack 45 in atop down manner. The armrests 40 are pivoted on the second rack 22 bythe pivot 42 and the slide sleeve 44, and the positioning cylinders 43below the armrests 40 are located correspondingly to the space A of thebase 20. Beneath the support portion 41 are sequentially arranged apositioning board 401, a partition board 402 and a base board 403 (asshown in FIG. 7), in the positioning board 401 and the partition board402 are formed a plurality of slide tracks 411 (which are in the form ofelongated holes in this embodiment) that are arranged in a crisscrosspattern. On the partition board 402 and on the base board 403 are formeda plurality of protrusions 412 to be moveably inserted in the slidetracks 411. The support portion 41 is positioned on the armrest 45 viathe slide tracks 411, and the user can use the crisscrossed slide tracks411 to make the positioning board 401, the partition board 402 and thebase board 403 move relative to one another, so that the support portion41 can be adjusted to different positions to support the user's arm.

The rail members 50 are in the form of a board, each of the rail members50 is mounted on the two positioning cylinders 43 below the armrest 40and is located in the space A of the base 20. In each of the railmembers 50 is formed a slot 51 for insertion of the pivotal shafts 31,and then the pivotal shafts 31 are moveably confined in the slot 51 ofthe rail members 50 by the retainers 311.

For a better understanding of the present invention, reference should bemade to FIGS. 4-6, the backrest 30 is pivoted to the first rack 21 ofthe base 20, so that the backrest 30 can be adjusted automatically ormanually to different angles according to the user's needs. Furthermore,at both sides of the lower end of the backrest 30 are coaxially arrangedthe pivotal shafts 31 on each of which being mounted an extending rack312, the pivotal shafts 31 are moveably confined in the slots 51 of therail members 50. Plus the armrests 40 are pivoted to the second rack 22by the pivot 42 and the slide sleeve 44.

By such arrangements, the rail members 50 will rotate within the space Aof the base 20 synchronously when the tilt angle of the backrest 30 isadjusted. Due to the rail members 50 are mounted on the two positioningcylinders 43 below the armrest 40, when the rails members 50 are drivenby the pivotal shafts 31 to rotate within the space A, the rails members50 will synchronously rotate the armrest 40. Meanwhile, the supportportion 41 of the armrest 40 will be tilted towards the second rack 22,and with the help of the crisscrossed slide tracks 411, the supportportion 41 can be adjusted to different positions in response to thetilt angle adjustment of the backrest 30, to support the user's arm.

It will be noted that another function of the present invention is thatthe slot 51 can be used to adjust the tilt angle of the armrest 40 dueto the slot 51 is a slant slot. Furthermore, the slot 51 also can beformed in different curvatures or tilt angles, so as to change the tiltangle of the armrest 40.

Referring to FIG. 8, slide tracks of the armrest in accordance withanother embodiment of the present invention are shown, wherein thepositioning board 401, the partition board 402 and the base board 403are also located below the support portion (not shown) of the armrest40, and the slide tracks 411 (which are in the form of a slide rod) arearranged at the upper and lower sides of the partition board 402. In thepositioning board 401 and the base board 403 are formed a plurality ofholes 413 for insertion of the slide tracks 411. The support portion 41is positioned on the armrest 45 via the slide tracks 411, and the usercan use the crisscrossed slide tracks 411 to make the positioning board401, the partition board 402 and the base board 403 move relative to oneanother, so that the support portion 41 can be adjusted to differentpositions to support the user's arm.

While we have shown and described various embodiments in accordance withthe present invention, it should be clear to those skilled in the artthat further embodiments may be made without departing from the scope ofthe present invention.

1. An armrest and backrest synchronous adjustment device for a massagechair comprising a base, a backrest, at least two armrests and two railmembers; wherein the base is formed with a space; the backrest ispivoted on the base and located correspondingly to the space of thebase; the armrests are pivoted to the base, and lower end of each of thearmrests is located correspondingly to the space of the base; and therail members are mounted at the lower end of the armrests or thebackrest and located in the space of the base, on each of the railmembers is formed a slot that is used to rotate the armrests when thebackrest is adjusted.
 2. The armrest and backrest synchronous adjustmentdevice for a massage chair as claimed in claim 1, wherein the base isfixed to a bottom of the massage chair and is set firmly on the ground,the base includes a narrow first rack and a wide second rack, the firstrack is located within the second rack, and the space is formed betweenthe first and second racks; the backrest is pivoted to the first rack ofthe base, and at both sides of the lower end of the backrest arecoaxially arranged two pivotal shafts; the armrests are pivoted to thesecond rack; and the rail members each is formed with the slot forinsertion of the pivotal shafts, and the slot is used to rotate thearmrests by cooperating with rotation of the pivotal shafts.
 3. Thearmrest and backrest synchronous adjustment device for a massage chairas claimed in claim 2, wherein an extending rack is mounted on each ofthe pivotal shafts at both sides of the lower end of the backrest. 4.The armrest and backrest synchronous adjustment device for a massagechair as claimed in claim 3, wherein a retainer is mounted on each ofthe pivotal shafts at both sides of the lower end of the backrest, andthe slot of the rail members is provided for insertion of the pivotalshafts, and then the pivotal shafts are moveably confined in the slot ofthe rail members by the retainer.
 5. The armrest and backrestsynchronous adjustment device for a massage chair as claimed in claim 4,wherein the armrests each includes a support portion, a pivot and twopositioning cylinders sequentially mounted on an armrest rack in a topdown manner, and the armrests are pivoted on the base by the pivot and aslide sleeve.
 6. The armrest and backrest synchronous adjustment devicefor a massage chair as claimed in claim 1, wherein a positioning board,a partition board and a base board are arranged sequentially beneath asupport portion, in the positioning board and the partition board areformed a plurality of slide tracks that are arranged in a crisscrosspattern, with the crisscrossed slide tracks, the support portion can beadjusted to different positions in response to tilt angle adjustment ofthe backrest, to support the user's arm.
 7. The armrest and backrestsynchronous adjustment device for a massage chair as claimed in claim 6,wherein each of the crisscrossed slide tracks is in the form anelongated hole, on the partition board and the base board are formed aplurality of protrusions to be moveably inserted in the slide tracks,the support portion is positioned on the armrest via the slide tracks,and the user can use the crisscrossed slide tracks to make thepositioning board, the partition board and the base board move relativeto one another, so that the support portion can be adjusted to differentpositions to support the user's arm.
 8. The armrest and backrestsynchronous adjustment device for a massage chair as claimed in claim 6,wherein each of the crisscrossed slide tracks is in the form a slide rodarranged at the upper and lower sides of the partition board, in thepositioning board and the base board are formed a plurality of holes forinsertion of the slide tracks, the support portion is positioned on thearmrest via the slide tracks, and the user can use the crisscrossedslide tracks to make the positioning board, the partition board and thebase board move relative to one another, so that the support portion canbe adjusted to different positions to support the user's arm.